Space based optical telescopes are fast becoming obsolete thanks to adaptive optics. Its a good thing really. Maintenance can be done after breakfast and before lunch without the hassle of hoisting someone into orbit.
I know there’s a 36 meter optical array in the works. Given the global economy its hard to say when it will come online. I have read that our first real look at an exoplanet will probably come from a ground based telescope.
And what NASA doesn't want you to know is that they could have launched new replacements for Hubble on unmanned rockets for much cheaper than a servicing mission.
Optical telescopes, maybe, but you can’t do UV on the ground, and there are a number of IR bands that are difficult on the ground. Unfortunately JWST, if it happens, is IR only.